STM32F207 access data to beyond flash size

[rndkd1]

I have STM32F207ZE and made a project that read and write data to flash memory.

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STM32F207ZE flash size is 512Kbyte.

but I tried writing data to a 0x80E0000 address(flash sector 11), it worked.

​Surprisingly, the STM32CubeProgrammer can also has access to that sector.

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Why can data be written to an address beyond of flash memory boundary?

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Is it ok to use beyond the flash memory size indicated in the datasheet?

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[Tesla DeLorean]

All the STM32F2 have 1MB on die, subsets of this are tested in an effort to reduce costs.

[rndkd1]

So Reading and writing to flash sector 11 in STM32F207ZE actually works, but is not guaranteed?

[Tesla DeLorean]

Yes, but I don't think they endrance test the earlier memory either, just operate it under stressed conditions looking for gross failure. ie do all cells erase and program.​

[AScha.3]

right.